The spectator ions in the reaction between aqueous perchloric acid and aqueous barium hydroxide are .

Question

Quizplus · Accepted Answer

In the given reaction, aqueous perchloric acid (HClO4) reacts with aqueous barium hydroxide (Ba(OH)2) to form barium perchlorate (Ba(ClO4)2) and water (H2O).

The balanced chemical equation for the reaction is: 
HClO4(aq) + 2Ba(OH)2(aq) → Ba(ClO4)2(aq) + 2H2O(l)

In this equation, H+, ClO4-, Ba2+ and OH- are the ions involved in the reaction. The spectator ions are the ions that do not participate in the reaction and remain unchanged before and after the reaction.

The spectator ions in this reaction are Ba2+ and ClO4-. Therefore, the best choice is C, which lists only these two ions as the spectator ions.

The Spectator Ions in the Reaction Between Aqueous Perchloric Acid